Unfortunately like so many other serious polls here it is going to be skewed with people that for the bitterness of hell know they smell gas and instead of just accepting the fact they lie to theirself as if to convince themselves its not really there. You see this alot around car forums with placebo mods and justifying of purchases and inability to be open minded sad sad folks

 

What evidence?

Why must you taunt us?

Pssst.... PM me the information... that way you won't get in trouble.

 

Or maybe they don't want to admit they messed up?
How can anyone know they are telling the truth?
Online polls are

 

Let me know if I have this incorrect but it sounds like it's the slug deposit from the mineral oil that seals everything tight. So, using mineral oil for one oil change should work no matter if it's done at 0 miles or 10k. Would that be a correct statement?

 

Unfortunately no. The break in process allows the rings to fully seat against the cylinder walls before the honing wears down. If this doesn't occur the only recourse is to open the engine, rehone the cylinders and reassemble with new rings. Voila! You get to break your engine in again.

 

Yikes! Too late... That's a pretty bold statement.

Shiv, I am not going to disagree with you, you know your stuff - although I will make an observation that there are far too many variables involved to isolate HP variability being due to dyno vs synthetic break-in. One of a number of variables, maybe... With all the variables and all the cause and effect issues, there is no right or wrong answer.

You also have to agree that use of dyno oil, especially in high rev high temp engines, will lead to sludge formation which will definitely reduce the longevity of an engine. Remember, it is the dyno oil breakdown sludge that is sealing your rings, etc... making it better performing according to the extensive info you have presented.

 

I agree. Odour is one of the most subjective physical tests there is. Over the years, I have been involved in a number of odour panels and there is never, never, ever a consensus - just a degree of relevance. What smells like one thing to one person, can smell quite different to another. ie, 1 vote is NOT equal one data point for any ONE sample, hence a need for a panel. However, in this particular case, an Electronic Nose (TM) can be very useful, if anyone can get a hold of one...

 

More fuel for the fire: I broke my car in like it says in the manual (using the factory synthetic) and the Vishnu gang did the HC test on my car and the numbers that came back were much lower than some of the other EVOs they tested. In addition, after Shiv tuned my car with Stage 0, my final numbers i think were above average.


Bryan

(Vishnu gang, let me know if I am wrong on any of the above)

 

Thank you so there is hope for the 90% of us EVO owners who broke in w/ synthetic btw, how many miles did you have on your car when they did the HC test? I trying to determine if more miles on synthetic will help sealing.

 

It was less than 2100 because i know it was before my first oil change, and i did that at 2100. Sorry but I don't have the exact mileage in front of me.

 

Do you remember the actual number of H/C in the oil?

 

Shiv,
No disrespect but I don't see what oil has to do with cold start emissions and stumbling when cold. Idle speeds are during warm up is based on coolant temps and it slowly drops as coolant temps increase. Oil temps are at operational temps long before coolant temps are. Running super rich at cold idle is for warming up the cats quickly and quickly getting the car to operational temperatures. If your car is stumbling when cold, syns or dino, you've got another problem.

 

Brett I think it was around 800 when you guys were seeing as high as 3000......but i could be totally off.

 

Yes that sounds right. 100-300 is typical on cars that do this H/C test. Most Evo's have been in the 1500-6000 range that have broken in on synthetic oil. That is of course very high and a cause for investigation.

 

Synthetic is thinner and thus creates less resistance making the engine turn over more easily thus necessitating less power to turn over the rotating assembly. This reduces the need for excessive fuel enrichment to keep the engine running smoothly when cold, thus cleaning up emissions during cold start. The enrichment needed to keep a cold engine running smoothly when the oil is cold is way beyond what the cat needs to light up.

The smooth running idle on high performance engines is very difficult to do with current emissions legislation. This gets worse if you have individual thottles for each cylinder and that's the reason why BMW M-cars have such crappy cold idle.